OAKMONT, Pennsylvania :Sam Burns moved closer to a major breakthrough as he held a one-shot lead over Australian Adam Scott, who turned back the clock to enter the mix, and J.J. Spaun after the third round of the U.S. Open on Saturday at Oakmont Country Club. Burns and Spaun took turns trading or sharing the lead for much of the day but it was the former who finished in front with a one-under-par 69 that brought him to four under on the week at the major that is considered golf's toughest test.